The York S1-024-27632-001 Pressure Switch is a critical safety component designed for specific HVAC pressure monitoring applications

ensuring seamless integration with existing liquid level controls

5-inch NPT pilot operated valve features a rugged forged brass body and NBR seals

an "Open Loop" (OL) reading on your multimeter indicates a failed resistor that needs replacement

This ensures predictable cooling cycles and prevents the evaporator from icing up in humid conditions

Lennox 21W14 Control Board 322057-301 The York S1-024-27632-001 Pressure SwitchThe Lennox 21W14 Control Board (OEM 101029 01) is an essential Direct Spark Ignition (DSI) Integrated Control Board designed for high performance gas furnaces. This replacement ignition control board operates on a 24VAC circuit at 50 60 Hz, managing critical combustion cycles including flame sensing, gas valve regulation, and combustion blower motor timing. Engineered for precise microprocessor control, the 21W14 eliminates the need for standing pilot